Peteb schmid ahd kabl geoss



TED STATES PAT l l PETER SGI-IMID AN D KARL GROSS, OF BASEL, SWITZERLAND; SAID GROSS ASSIGNOR TO SAID SCHMID.

FOAM OR FRO'III DYEING-BA'IH FOR SILK.

No Drawing.

To all whom it may concern:

Be it known that we, PETER SGHMID, a citizen of the Swiss Republic, and KARL Gnoss, a subject of the King of Prussia, both residing in Basel, Switzerland, have invented a new and useful Foam or Froth Dyeing- Bath for Silk, of which the following is a full, clear, and exact specification.

The baths for dyeing silk hitherto employed in form of foam or froth are prepared with soapy water, whereby occurs the inconvenience that they can only be used for dyeing in a basic or neutral bath.

The present invention has for its object to remove this inconvenience and is based upon the use of the liquid resulting from the boiling of silk-worm-chrysalises with water instead of soapy water for the preparation of the dyeing bath. A liquid dyeing bath prepared with this liquid can be transformed into foam or froth withoiit use of soap. The silkworm-chrysalises necessary for the preparation of this liquid may be employed inthe form of silk wastes containing silkworm-chrysalises, as for instance in form of bassinets (Italian gaZZetta/rm'ni, French palettes). To the Water used for the preparation of the said liquid sericin can be added.

A dyeing bath according to this invention can be prepared as follows: 8 to 10 kg. silkworm-chrysalises are boiled with 300 kg. water and the desired dyestufi is introduced in the liquid thus obtained. By heating this bath with a steam coil, it can be trans- Specification of Letters Patent.

Patented'Aug. 1,1916.

Application filed October 7, 1915. Serial No. 54,501.

formed into a froth or foam. The silk is dyed for 10 to 30 minutes in the so obtained froth or foam bath, the silk being subjected to a very little moving in the said froth or foam bath.

In the foregoing example the silkwormchrysalises can be replaced by the same quantity of bassinets.

With the new dyeing bath transformed into froth or foam silk in every form can be dyed as raw silk, silk wastes, silk tissues, silk spuns, etc., ungummed and not weighted or ungummed and weighted or raw and not weighted or raw and weighted.

What we claim is:

1. A foam or froth dyeing bath for silk prepared with the liquid obtainable by boiling of silkworm-chrysalises with water.

2. A foam or froth dyeing bath for silk prepared with the liquid obtained by boiling silk wastes containing silkworm-chrysalises with water. 7

3. A foam or froth dyeing bath for silk prepared with the liquid obtained by boiling silkworm-chrysalises with water containing sericin.

In witness whereof we have hereunto signed our names this 14th day of September 1915, in the presence of two subscribing witnesses.

PETER SC'HMID. KARL GROSS. Witnesses:

ARNOLD ZUBER, ARMAND BITTER.

Gopies of this patent may be obtained for five cents each, by. addressing the Commissioner of ratenta,

Washington, D. G. 

